Muffler pipe cut off tool



Nov. 29, 1960 T. E. BRooKs MUFF'LER PIPE CUT OFF TOOL WVU/TOR:

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United States Patent@A MUFFLER PIPE CUT OFF TOOL Thomas E. Brooks, Clarinda, Iowa, assignor to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Filed Apr. 6, 195?, Ser. No. 804,511

2 Claims. (Cl. 30-102) This invention relates to a cut off tool particularly designed for light gauge pipes such as muflier pipes.

One object of the invention is to provide a pipe cutter of the general character above mentioned which is relatively simple and inexpensive to manufacture, being made for the most part from sheet metal stampings.

Another object is to provide a cutter construction in which a cam is slidable along a rod and is engageable with pivoted arms that carry cutter discs for camming the arms about their pivots and the cutters thereby toward a pipe while rocking the tool thereon for cutting the pipe in two.

A further object is to provide a simple head for the rod consisting of a flat plate secured in a slot of the rod, and the arms that carry the cutting discs being each a pair of sheet metal stampings pivoted on opposite sides of the head with the cutting discs located between them on pivots that extend through the two portions of the arm, the arms similarly carrying rollers for engaging the cam, etc.

Still a further object is to provide a cam consisting of a pair of plates secured together and formed with half hubs on opposite sides of the rod for providing a sliding connection therewith.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my mufiler pipe cutter, whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in detail on the accompanying drawing, wherein:

Fig. 1 is a perspective view of my muier pipe cutter;

Fig. 2 is a plan view thereof, parts being broken away and other parts being shown in section; and

Figs. 3, 4 and 5 are vertical sectional views on the lines 3 3, 44 and 5-5 respectively of Fig. 2.

On the accompanying drawing l have used the reference numeral to indicate a rod and 12 a head secured thereto. The plate-like head 12 is stamped from relatively thick sheet metal and is received in a slot of the rod as shown in Fig. 4, the head being secured in the slot by a pair of rivets 14.

Pivoted at 16 on the head 12 are two arms 18, each arm being of dual character in the form of a pair of stamped plates on opposite sides of the plate-like head 12 and spaced from each other by the head, spacers 28 being also provided in the outer ends of the arms as shown in Figs. l and 2 and spot welded therein at 29. These outer ends of the arms 18 carry inner cutter discs 20 adjacent the head 12 and outer cutter discs 22 adjacent the outer ends of the arms 18 which rotate on pins or rivets 24 and 26 respectively extending through the dual arms 18.

At their inner ends the arms 18 carry cam rollers on rivets 32. A cam 34 of V shape is slidable on the rod 10 and has inclined cam edges 33 which are engageable with the cam rollers 30 as shown in Fig. 2.

I2,961,765 `late'n'ted Nov. '22, 11960 LCC The cam v34 'is formed of two sheet -metal Aplates withhalf hubs 35 formed therein and the plates are spot welded together as indicated at 38. The Vrollers 30 lare Eheld 1in engagement with the cam 34 by a wrap-around spring 48 in notches 47 of the levers 18.

The outer end of the rod 10 is threaded as indicated at 40 and a handle 44 is screwed thereon, the handle being of plastic or the like and having an internally threaded sleeve 42 fixed therein and cooperating with the threads 40. A relatively heavy compression spring 46 is located on the rod 10 between the cam 34 and the handle 44.

It will be obvious that the pipe cutter disclosed is comparatively simple to manufacture, being formed for the most part from sheet metal of relatively heavy gauge, and the construction is suitable for punching out the parts on a punch press. Spot welded construction then retains parts assembled and the double thickness character of the cam 34 as well as the arms 18 make for a simple yet efficient and mechanically balanced construction, as the rollers 30 and the cutting discs 20, as Well as the head 12, are thus confined between opposed arms 18 which, due to their width, are suiiciently rugged for pipe cutting purposes when the pipe cutter is used on relatively light pipes such as muffler pipes and the like as illustrated at 50.

Practical operation In the operation of my muier pipe cutter, the handle 44 is backed olf suiciently so that the arms 18 are spread by the spring 48 and can be placed on opposite sides of the muiller pipe 50. The handle 44 is then screwed onto the lrocl 10 to move the cam 34 forwardly as to the position shown in Fig. 2. The cutting discs 20 are now in engagement with the pipe 50 and desirably the exertion of pressure by compression of the spring 46 is such as to not crush the pipe 50. The tool is then rocked through as wide an arc as possible, being sure that the discs 20 track to form the groove 52 shown in Fig. 5, or in other words the four segments of the cut meet.

The rocking motion is continued, the spring 46 providing the desired pressure of the cutting discs 20 on the pipe 50 and obviating frequent screwing of the handle 44 onto the rod 10. A quick and clean cut results with the necessity of adjusting the pressure through the handle 44 only once or twice lduring the entire cut-off operation.

Some changes may be made in the construction and arrangement of the parts of my muler pipe cutter Without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may reasonably be included within their scope.

I claim as my invention:

:1. In a muler pipe cutter of the character disclosed, a rod slotted at one end, a plate-like head located in said slot and secured to said rod, a pair of arms pivoted to said head and each comprising a pair of plates adjacent opposite surfaces of said head, a pair of pipe cutter discs carried by each of said arms beyond said head and between the plates forming said arms, cam followers carried by the opposite ends of said arms and between said plates, a V-shaped cam slidable on said rod with its cam edges engaging said cam followers, and a handle threaded on said rod and operable to move said cam therealong.

2. In a pipe cutter, a rod, a head thereon, a pair of arms pivoted to said head, pipe cutter discs carried by said arms beyond said head, cam followers carried by the opposite ends of said arms, a V-shaped cam on said 4 rod, a handle threaded on said rod and operable to move References Cited in the le of this patent said cam therealong, and a compression spring interposed UNITED STATES PATENTS between said cam and said handle, said head comprising a plate secured in a slot of said rod, and said cam com- 3641090 Clayton May 31 1887 prising a pair of sheet metal plates formed with half 5 118541389 Arffdt Apr' 19' 1932 hubs and secured together, said half hubs surrounding 2,325,353 Wright July 27 1943 said rod and beingslidable thereon. l 2,870,536 Lutskef Jam 27, 1959 

